There's a lot bowlers who feel you need to "Break in" a new ball. Before it starts working at it's best.
Yes ball surfaces will change with use, polished balls will get duller and dull balls will shine up. The general rule of thumb was that the balls surface would wind up about a 600 grit surface. Now this was more when there more wood lanes, because they have a lot more texture than synthetics.
Though I believe they have now changed this to about 800 grit. Do to the synthetic lane surfaces and change of coverstock materials.
IMO He's not referring to the oil that's being absorbed into the ball. (Though it does and the ball can get a glaze on it.)
It's more about the matte surface of the ball getting smoothed some as it gets wear from friction with the lane.
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